探讨赛艇运动员划桨技术动作的相关特征

赛艇运动是最考验运动员体力和耐力的运动,赛艇运动需要体力更需要技术,因此赛艇运动员在加强体能锻炼的同时更要注重运动中划桨技术等专项技术的训练,这样才能充分发挥体能和水平.在运动中取得更好成绩.本文简单阐述了赛艇运动中划桨技术的相关动作特征,并提出了一些积极建议.     

青少年体力活动水平测量和评价的研究现状与展望

运动不足症作为一种严重影响广大青少年身心健康的常见疾病,愈来愈受到世人的关注,而预防运动不足症的关键是如何测量与评价青少年每天的体力活动水平,因此,研究青少年体力活动水平测量和评价方法已成为体育研究工作中急需解决的问题.本文就青少年体力活动水平测量与评价的研究现状进行综述,并对这一课题未来的研究走向与方法谈一些浅显的认识.     

校园封闭管理下大学生体力活动与负性情绪相关分析

为分析校园封闭管理下在校大学生的体力活动水平与负性情绪的相关性,探讨不同体力活动水平对大学生负性情绪的影响.以299名在校大学生为调查对象,用国际体力活动问卷(短卷)和抑郁-焦虑-压力自评量表分别评估体力活动水平和负性情绪.结果表明：1)校园封闭管理期间,在校女大学生体力活动水平偏低;50%左右的学生存在不同程度的负性情绪,性别差异不明显(P>0.05).2)非参数相关分析结果为体力活动水平与抑郁、焦虑、压力之间呈负相关,相关系数显著性检验均为P<0.001.3)在男生负性情绪方面,与低体力活动组相比,中体力活动组无显著差异(P>0.05),高体力活动组有非常显著性差异(P<0.001);但高体力活动组与中体力活动组之间无显著差异(P>0.05).在女生负性情绪方面,与低体力活动组相比,中体力活动组只有抑郁情绪有非常显著性差异(P<0.001),高体力活动组3种负性情绪均有显著差异(P<0.05);高体力活动组与中体力活动组之间无显著性差异(P>0.05).校园封闭管理期间,体力活动水平和抑郁、焦虑、压力之间存在负相关,需要达到高体力活动...     

尾砂充填体力学参数混沌优化反分析研究

采场尾砂胶结充填体力学参数难以在实验室得到,有必要用反分析方法获取.采用有限元方法对不同充填体力学参数的变形结果进行计算,建立充填体力学参数与其变形结果的神经网络映射模型.用混沌优化与神经网络映射模型相结合,实现了充填体力学参数反演计算.对安庆铜矿高阶段充填体工程实例进行了分析,得出了不同配比尾砂胶结充填体力学参数.研究结果表明,混沌优化与神经网络相结合的反分析方法能实现全局寻优,具有较高的计算精度.图2,表3,参8.     

我国体力活动研究现状

随着科学、经济的飞快发展,人们的生活方式发生了巨大的变化,体力活动不够致使健康问题增多,影响了人们正常的生活方式.体力活动的研究已受到广大专家学者的关注,从体力活动的概念、体力活动与健康、体力活动的测量、体力活动水平评价、影响个体体力活动的因素等方面对我国体力活动研究现状进行分析探讨,希望能够为今后科研工作提供参考.     

体力活动与心血管疾病

在查阅大量资料的基础上,本文综述了国内外体力活动与心血管疾病的相关研究,为今后进行体力活动预防心血管疾病的相关研究提供参考。     

关于平面弹性力学Navier方程特解的一点注记

本文讨论含非常见体力项的平面弹性力学Navier方程特解的求法.     

具有体力的边界积分方程的整体变换法

本文提出用整体变换法求解有体力(自重.等角速旋转惯性力和稳定温度荷载)的边界积分方程.     

重庆微型体育文化公园建成环境对老年人体力活动的影响

将高密度城市发展中常被忽视的边角地微型公园化，是提高城市品质的重要手段.在当今人口老龄化加剧、慢性病发病率增高的时代，建设微型公园也是促进老年人参与体力活动，建设健康城市的重要途径之一.以重庆市9个微型体育文化公园为研究对象，在对公园建成环境和老年人体力活动现状调查的基础上，采用相关分析和核密度分析等方法，对公园建成环境进行定量与定性分析.结果显示，在环境要素上，座椅密度、器械密度和商业设施对老年人体力活动具有支持作用；从活动空间看，体力活动更多发生在硬质活动场地，其余依次为球类场地、健身器械场地、儿童活动场地和商业设施场地.在此基础上，为促进老年人参与体力活动，促使更多中高强度体力活动的发生，对微型体育文化公园的规划设计提出了优化建议.     

多体系曲线约束几何性状研究及其对滑道连接系统动力响应之影响

本文强调了在高精要求下,航天飞行器以至地面或海底步行机械、高速车辆、精密机床、各类机械手以及激光机器人等.无不受到多体力学之制约.若忽略之则其精度误差往往将是不能容忍的.本文强调了约束研究对多体力学重要性,挠臂空间曲线几何性状研究之必要性、重要性,及其对滑道连接系统之动力学控制影响.文中还论证了非自然坐标参数方程向自然坐标参数方程转换之可能性以及实际方法.文中还结合一个实例分析了有关计算之复杂程度.文章指出几何参数将通过拉氏乘子等影响到系统约束力及系统响应.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with